package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     */
    @Transactional
    @Override
    public void submit(Orders orders) {
//      获得当前用户id
        Long userId = BaseContext.getCurrentId();

//      查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lqw=new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(lqw);
        if(shoppingCarts==null||shoppingCarts.size()==0){
            throw new CustomException("购物车为空,不能下单");
        }

//        查询用户信息
        User user = userService.getById(userId);

//        查询地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if(addressBook==null){
            throw new CustomException("用户地址信息有误,不能下单");
        }

        long orderId = IdWorker.getId();//使用工具生成订单号
        orders.setId(orderId);

//        进行购物车的金额数据计算，顺便把订单明细给计算出来
        AtomicInteger amount = new AtomicInteger();//使用原子类来保存计算的金额结果
//        这个item是集合中的每一个shoppingCarts对象，是在变化的
        List<OrderDetail> orderDetails=shoppingCarts.stream().map(((item)->{
//            每对item进行一次遍历就产生一个新的orderDetail对象，然后对orderDetail进行设置，然后返回被收集，被封装成一个集合
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(item,orderDetail);
            orderDetail.setOrderId(orderId);
//            addAndGet进行累加 item.getAmount单份金额 multiply 乘 item.getNumber 份数
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        })).collect(Collectors.toList());


//        向订单表中插入数据，一条数据,因为前端传来的数据太少了，所以我们需要对相关的属性进行添加
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);

//        Amount是指订单总的金额
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        if(user.getName()!=null){
            orders.setUserName(user.getName());
        }
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        this.save(orders);

//        向订单明细表插入数据,多条数据
        orderDetailService.saveBatch(orderDetails);
//        清空购物车,lqw封装了userId我们直接使用这个条件来进行删除就行
        shoppingCartService.remove(lqw);

    }
}
